Electric transformer



July 17, 1928.

W. S. WERNER c TRANSFORMER 3 Sheets-Sheet 1 Filed June 2. 1921 July 17,1928.

W. S. WERNER ELECTRIC TRANSFORMER Filed June 2, 1921 3 Sheets-Sheet 3 "nrf/ 4/7 7 C C((CC /A//7 r CCCCCCC CCCC lll r P M R p Patented July 17,1928.

UNITED STATES WILIBUR S. WERNER, 0F COVINGTON,

MANUFACTURING- COMPANY, KENTUCKY.

KENTUCKY, ASSIGNOR TO THE KELLEY-KOETT OF GOVINGTON, KENTUCKY, ACORPORATION OF ELECTRIC TRANSFORMER.

Application filed June 2,

An object of'my invention is to provide a transformer adapted to producehlgh tension currents of same or diflerentvoltage, but of dissimilarkilovolt ampere output,

or, as it is commonly termed kva. output) rom a given secondary or hightension winding and given primaries of low tension current.

Another object is to provide a transformer for the purpose statedwhereinthe magnetic flux in the core may be made the resultant of a pluralityof primary windings, wherefore the kva. output of the induced currentmay be varied in direct relation to the resultant flux.

Another object is to provlde a compact transformer for the purposesstated that 1s simple in construction and operation.

These and other objects are attained by the means described herein anddisclosed in the accompanying drawings, in which Fig. 1 is a sectionalview on line 1-1 of Fig. 2.

Fig. 2 is a sectional view on line 22 of Fig. 1.

Fig 3 is a diagrammatic view of the locations of the windings of thetransformer.

Fig. 4 shows a modified wiring -diagram for the device of the invention.

Myv invention comprises a core A having a main or body portion a adaptedto extend through a secondary winding 0 and having branches (1 adaptedto lie outside of the secondary winding. A main primary winding 6 isprovided for the center or body portion of the core adapted to extendthrough the secondary windings C, and auxiliary primary windings b" areprovided for the arms of the core. The main primary w1nding, or in otherWords, the winding contained interiorly of the secondary windings isadapted to be embraced within a primary circuit independent of and tothe exclusion of the auxiliary primary winding. In like manner theauxiliary primary windings may be embraced in a closed circuit withoutsending any of the current through the mam primary wlnding. By employingthese series of primar windings, it is possible to var the intenslty ofthe magnetic flux througi the core, wherefore it is possible to vary thekva. ouput of the high tension current created in the secondary winding.

The core A is built up of a series of laminations having substantiallythe figure of 1921. Serial 1570. 474,440.

the numeral 8. The main or center portion a of the core has wound uponit a main primary winding 6, as is common in the art. The arms a of thecore have wound about them the auxiliary primary windings b. When themain primary winding 1) is embraced within a closed circuit, themagnetic flux follows the arrows shown in Fig. 3, being strongest in thecenter portion of the core, the arms a completing the path whereby thelines of force passfrom and between the opposite poles of the magnetdeveloped 1n the center portion a of the core. When the auxiliarywindings Z) are embraced withm a closed circuit, the arms a become themagnets which effect the secondary wind- 1ngs, and the center portion aof the core provides a'path whereby the lines of force may extend incontinuity between the poles of the magnets into which the arms a aredeveloped. The windings b are preferabl in such direction that themagnetic flux will follow the same path as when the main primary windingis employedto develop the center portion a into a magnet, wherefore theauxiliary primary windings are developed into co-operative forces inmagnetizing the center portion of the core and in setting up lines offorce inducing the secondary current.

The secondary windings comprise a series of units 0 extending around thecenter portion a of the core and the main primary winding 6. The units aare connected in seris. The units c are disposed intermediate theauxiliary primary windings Z) upon the arms a. The units 0 are spacedand are retained in spaced relation by means of fiber washers a mountedon each side of each unit, and by means of insulating blocks a disposedintermediate the adjacent washers c. The end unitsare spaced from theends of the core by means of insulating blocks 0 The laminations of thecore A are secured upon one another by the end clamps d having threadedsockets 0! formed upon their upper ends. The end clamps on each end ofthe core A are positioned and secured upon the core by means of thebolts (2 The core A, together With the windings thereon, is adapted tobe mounted upon the top or cover 6 of a casing E, and to be suspendedinteriorly of the casing E. The casing E contains oil in suflici'entquantity that the primary and secondary coils are immersed therein. Theterminals of the several windings extend through the cover 0. Theconductors leading from the secondary windings are preferably insulatedby means of mica. tubing f.

The operation of my device is as follows. Reference is made to Fig. 3.

The transformer is connected to a suitable source of alternatingcurrent.

When current is directed through the main primary winding 12 by way ofsuitable switches, and the terminals X and Y, the core a attains itsmaximum stren th as a magnet and an induced current of t e maximum kva.output is created in the secondary windings as is common in the art.

When a similar current is directed through the auxiliary primarywindings b by way of a suitable switch and the contacts Y and Z, thecore a is magnetized to a lesser extent than when the main primarywinding is embraced in the circuit, and an induced current of a lowerkva. output is set up in the secondary coils. The relative kva. outputof the currents set up in the secondary coils by the excitation of themain primary winding and the auxiliary primary windings is determined bythe relative winding in these two primary windings, provided the.primary current is constant. It is possible to wire all the primarywindings, in parallel, and in different combinations, from all whichvarious secondary currents may be induced, for example as shown in Fig.4 wherein the simple addition of another switch W attains such result.Also the primary windings may be connected in series whereby olifferentcombinations will induce a current of other capacities. The voltageswill, of course, be also determined by the number of windings, etc.

From the foregoing it is readily apparent that the number of arms a maybe varied and that the relative windings on the arms may be carried,whereb it is possible to employ the same secon ary winding, and yetproduce high tensioned currents of various capacities therefrom. Thesecondary winding is preferably grounded upon the core at G. The core inturn is grounded.

What I claim is:

1. In a transformer the combination of a core havin a body and branches,a main rimary win ing on the body and an auxiliary primary winding oneach of the branches, a secondary winding about the body of the coreintermediate the branches, and a switch adapted to selectively connectthe primary windings with a primary electrical circuit.

2. In a transformer the combination of a main core, a branch coreextending in magnetic continuity from the main core, a primary windingon the main core, a'primary winding on the branch core, a secondarywinding about the main core and extending intermediate the main core andthe branch core, and a switch adapted to direct a cur rent througheither primary winding.

3. In a transformer, the combination of a main core, a branch core inmagnetic continuity with the main core, a primary windmg on the maincore, a primary winding on the branch core, a single secondary windingabout the primary winding about the main core and extending intermediatethe branch and main cores and switch means for jointly and severallyconnecting the primary windings to a primary electrical circuit.

In testimony whereof, I have hereunto iglgicribed my name this 31st dayof May,

WILBUR S. WERNER.

